It's also needed for just making sure your internet is setup properly at home. Nobody cares about your speed test over wifi, but ISP's sometimes care if you can

It's also needed for just making sure your internet is setup properly at home. Nobody cares about your speed test over wifi, but ISP's sometimes care if you can't get anywhere close to the rated speeds over Ethernet. And of course that setup still requires Ethernet. Can't setup a wifi ap over wifi.